linux-kernel - Re: Status of function-sections work?

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Message-ID: <20110607084349.GC4599@leaf>
Date:	Tue, 7 Jun 2011 01:43:49 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Status of function-sections work?

On Tue, Jun 07, 2011 at 10:11:15AM +0200, Denys Vlasenko wrote:
> On Monday 06 June 2011 03:15, Josh Triplett wrote:
> > Hello,
> > 
> > I found your work in 2010 on using function-sections and data-sections
> > to eliminate unused code in the kernel.  I'd like to make use of this
> > work to try to build an extremely space-constrained kernel.
> > 
> > It looks like a few of your patches made it into the kernel, but most of
> > the linker script changes don't seem to have made it in.  I wanted to
> > find out the status of this work.  Do you still have this working?  Do
> > you have versions of your patches for current Linux?
> 
> parisc uses ^ in some identifiers. Therefore we need something like
> [A-Za-z0-9_$^]* in linker script. This wasn't working with GNU ld -
> ^ is not a valid char for pattern. Use of more general [!.]*
> was also impossible - ! is not a valid char too.
> 
> Therefore I asked binutils people to fix this (they agreed) and
> decided to wait for a fixed binutils to be released.

Makes sense.  Thanks for the explanation and status.

Do you know if the fix has gone into binutils, either in a release or
the latest snapshot from version control?  If not, does a patch exist?

- Josh Triplett
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